Risteska, Aleksandra, and Mirjana Kocaleva Vitanova. “APPLICATION OF FUNDAMENTAL LEMMA OF VARIATIONAL CALCULUS TO THE PROBLEM OF PLATEAU”. Balkan Journal of Applied Mathematics and Informatics 6, no. 1 (June 20, 2023): 17-24. Accessed May 10, 2024. https://js.ugd.edu.mk/index.php/bjami/article/view/5646.